tests showing american students are lagging. the program for international student assessment, testing 15-year-olds around the world. now top scorers were in asian countries. united states is actually in the middle of the packet, did not even crack the top 20. in fact, only 9% of teens scored in the top two levels of math, compare that to shanghai. but also places like czech republic, and latvia, all did better than u.s. students. for what it is worth they did better than mexico, indonesia, and jordan. the quite has not approved its scores much. the picture of stagnation, so tony, not good news for the united states. you want to try one of these questions. >> excise me? >> these are the same questions by the way 15-year-old kids are facing. here is the first one. revolving door including three wings which rotate within a circular shape. >> i just read that into the tease, i had no clue -- >> it is that question. >> right. >> 15-year-old students have to answer. >> go down to the bottom, what is the maximum number of people that